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GB/T9808-2008Q / XJY118-2010 Mining & Drill Tubes With Alloy Steel Grade GB/T9808-2008Q / XJY118-2010 Mining & Drill Tubes With Alloy Steel Grade O.D 5-420mm W.T 0.5-50mm L Max 12000mm Application For wire-line drill rods,core barel tubes ,drill rods coupling casing Steel Grade and Chemical Compositions Steel Tensile Strength Yield Point Elongation Heat Treatment Grade Mpa Mpa % Min ZT380 640 380 14 Normlized ZT490 690 490 12 Normlized ZT540 740 540 12 Normlized ZT590 770 590

GB/T9808 ZT380 Good OD and ID tolerance Seamless Steel Tubes Size: OD:33-340mm WT:2-28mm L:4000mm-12500mm Steel Grade: ZT380,ZT490,ZT520,ZT540,ZT590,ZT640,ZT740 The Production method: Hot rolling(extrusion) or cold drawing(rolling) seamless method. Delivery State: Hot rolling(extrusion)steel tubes should be delivered with hot rolling condition or hot finished.Cold drawn(rolling) steel tubes should be delivered with hot finished. Surface quality There is no visual visible

Seamless Steel Tubes for Petroleum Cracking GB 9948 Spec: Material:10# 20# 12CrMo 15CrMo st37 st42 Size Range: OD:4-1200mm WT:0.3-200mm General Length:4-12m Tolerance: According to the following tables or customers’ request. Table1 The Tolerances of Outer Diameter and Wall Thickness Unit:mm Sort Code Manufacuring Method Nominal Size Tolerances Common Level High Level W-H Hot Rolling (Extrusion) Outer Diameter D ≤54 ±0.50 ±0.30 >54~325 ±1%D ±0.75%D >325 ±1%D - Wall Thicknass S

Product Name: JIS G3465 Alloy Steel Grade Oil Drill Mineral Mining Seamless Steel Tubes Size range: O.D.:6-420mm W.T.:0.5-50mm L:4000-12500mm according to customers' actual application and production. Application : For Geological Drill underground for Oil and Mineral, for Mining Exploration,for Wire Line Drill Rod, Casing Tube, Core Barrel Tubes, Couplings Steel Grade: STM-R780, ZT380,ZT490,ZT520,ZT540,ZT590,ZT640,ZT740 Material: 37SiMn 38CrMoAl 30CrMnSi(A) Heat treatment:

ASTM A519 4130 4140 +N Q+T Seamless Drilling Steel Pipe for Geological Exploration Standard: ASTM A519 ASTM A519 4130 4140 +N Q+T Seamless Drilling Steel Pipe for Geological Exploration Size range: O.D.:6-350mm W.T.:1-50mm L:max12000mm Applications: for Machinery, Mechanical Engineer Raw Material: Round Steel Billet from Bao Steel Production: Hot Piercing→Cold Drawing → Sizing to final dimension Heat Treatment: + N, Q+T Steel Grade and Chemical Compositions: Steel C Mn P S Si

JIS G 3465 STMC-C-540 , STMC-C-640 , STM-R-590 , STM-R-690 , STM-R-780 , STM-R-830 Seamless Steel Tubes for Drilling JIS G 3465 Seamless Steel Tubes for Drilling Steel Grade: STMC-C-540, STMC-C-640, STM-R-590, STM-R-690, STM-R-780, STM-R-830 Dimension: OD *WT according to customers' actual application and production. Application : for Wire Line Drill Rod, Casing Tube, Core Barrel Tubes, Couplings Heat treatment: Normalized, Q+T CHEMICAL COMPOSITION % max C Si 0.04 0.04

JIS G 3465 Seamless Drill Steel Pipes and Tubes for Drilling for mineral exploration JIS G 3465 Seamless Steel Tubes for Drilling Dimension:OD 30-150mm, WT: 3-20mm Application :for Drill rod, Casing tube, Core tube CHEMICAL COMPOSITION % max C Si 0.04 0.04 MECHANICAL PROPERTIES min Steel grade Tensile strength Mpa Yeild point or proof stress Mpa Elongation % STM-C-540 540 - 18 STM-C-640 640 - 16 STM-R-590 590 375 18 STM-R-690 690 440 16 STM-R-780 780 520 15 STM-R-830 830 590

Drill Pipes for Oil and Mineral Mining Applications: For Geological Drill underground for Oil and Mineral, for Mining Exploration Straightness, Concentricity, Mechanical Properties can meet the requirement of DCDMA (USA), BS4019 (UK), METRIC (SWEDEN) Size range: O.D.:6-95mm W.T.:1-10mm L:max12000mm Standard Producton Method Tube Size Tolerance GB/T 9808-2008 Hot rolled OD (+1.0%D) +0.65 (-0.5%D) -0.35 WT ≤10 (+15%S) +0.45 (-10%S) -0.35 ＞10 (+12.5%S, -10%S) Cold Drawn OD ±0.50